Aufsatz(elektronisch)#1Positive Association of the Number of Oocyte Retrievals With the Maternal hCG Concentration in Early Pregnancy After in vitro MaturationIn: HELIYON-D-21-04801Wang, Yapeng; Lin, Shengli; Zheng, Xiaoying; Lian, Ying; Yang, Rui; Liu, PingWang, Yapeng; Lin, Shengli; Zheng, Xiaoying; Lian, Ying; Yang, Rui; Liu, PingOpen Access